San Diego Gas & Electric Company (SDG&E) seeks to procure resources to meet electric system reliability needs as required by California Public Utilities Commission (CPUC) Decision 21-06-035 and Decision 23-02-040. SDG&E is soliciting offers from owners and operators for the purchase of eligible resource adequacy (RA) to come online by August 1, 2023, June 1, 2024, June 1, 2025, or June 1, 2026. Decision 23-02-040 requires SDG&E to solicit additional incremental offers for eligible RA to come online by June 1, 2026, and June 1, 2027, with long lead-time resources including long duration energy storage and firm zero-emitting resources potentially postponed to June 1, 2028. SDG&E requires procurement of at least 361 megawatts (MWs) of additional net qualifying capacity (NQC), with specific requirements: 63 MW by August 1, 2023, 188 additional MW by June 1, 2024, 47 additional MW by June 1, 2025, and 63 additional MW by June 1, 2026. The RFO solicits a broad range of resources including demand side resources, distributed energy resources, energy storage, renewable generation, geothermal, pumped storage, and hybrid energy storage systems. All contracts for resources, including firm energy imports, must have a minimum duration of 10 years. Qualification is measured based on September NQC calculations using marginal ELCCs calculated by the Commission for each resource type for each future online year.